EP0910520B1 - Druckempfindliche luftsack-entlüftungsvorrichtung - Google Patents

Druckempfindliche luftsack-entlüftungsvorrichtung Download PDF

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Publication number
EP0910520B1
EP0910520B1 EP97923421A EP97923421A EP0910520B1 EP 0910520 B1 EP0910520 B1 EP 0910520B1 EP 97923421 A EP97923421 A EP 97923421A EP 97923421 A EP97923421 A EP 97923421A EP 0910520 B1 EP0910520 B1 EP 0910520B1
Authority
EP
European Patent Office
Prior art keywords
airbag
sealing member
inflation
ventilation opening
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97923421A
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English (en)
French (fr)
Other versions
EP0910520A1 (de
Inventor
David James Cundill
Stuart James Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Breed Automotive Technology Inc
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Breed Automotive Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Breed Automotive Technology Inc filed Critical Breed Automotive Technology Inc
Publication of EP0910520A1 publication Critical patent/EP0910520A1/de
Application granted granted Critical
Publication of EP0910520B1 publication Critical patent/EP0910520B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/239—Inflatable members characterised by their venting means

Definitions

  • the present invention relates to methods and apparatuses for venting an inflation gas from the interior of an airbag, and more specifically to methods and apparatuses for venting an inflation gas after a pre-determined inflation pressure threshold has been reached in the airbag.
  • vehicle occupant protection systems which include airbags, to protect a vehicle occupant from injury in the event of a crash.
  • the airbag is stored in a deflated condition within the steering wheel or a component of the vehicle interior.
  • the airbag rapidly inflates due to the introduction of an inflation gas into the airbag interior. It is usual to provide excess inflation gas to the airbag interior to increase the speed of airbag deployment. The excess inflation gas must be vented in order to enhance the cushioning effect of the airbag upon an occupant and to prevent failure of the airbag when impacted by the forward movement of the occupant.
  • US 3 733 091 teaches an inflatable vehicle occupant restraint which allows only very limited venting of inflation gas from the inflation chamber through what is characterized as approaching a one-way valve for the passage of gas into the inflation chamber.
  • US 3 762 741 teaches the use of rupturable diaphragm or membrane to provide a "conventional blowout patch" for pressure relief of an inflatable occupant restraint device. However; the actual structure of the rupturable diaphragm or membrane is not disclosed or suggested in US 3 762 741.
  • US 3 879 057 teaches an inflatable vehicle occupant restraint having an exhaust hole which is normally closed by a blocking member which is connected to a restraining member located inside the airbag, the restraining member being responsive to a force exerted on the airbag by a vehicle occupant to open and close the exhaust hole.
  • US 3 820 814 teaches the use of a "discharge valve" which controls the effective area of a discharge aperture as a function of the gas pressure inside of an airbag.
  • US 3 887 213 teaches an inflatable vehicle occupant restraint having a plurality of "blow-off patches" provided on the end wall thereof for preventing rebound upon contact with a vehicle occupant.
  • the "vent or patches” Upon contact of the inflated member with the vehicle occupant the "vent or patches” retain air in the inflated member until a predetermined level on inflation pressure is obtained, at which pressure level the "patches or vents” open or pop off, to permit immediate escape of air from the inflated member.
  • the particular construction of the vents or patches "will be a matter of choice to those skilled in the art.” No structure for the "vents or patches” is disclosed or suggested in this publication except in the drawings, where they appear to be nothing more than flaps.
  • US 4 097 065 teaches an airbag having a gas permeable patch which at all times allows inflation gas to escape from the airbag, but has a slackening portion to prevent the gas permeable patch from being torn or separated from the airbag material as the inflation pressure increases.
  • US 4 360 223 teaches a check valve which is used with an inflatable vehicle occupant restraint which has more than one inflation chamber to control pressure differentials between the chambers.
  • This check valve has mating flaps which overly an opening and allow one-way passage of gas therethrough.
  • US 4 805 930 teaches an airbag structure wherein stitched thread seams between fabric elements extends in response to inflation pressure causing the film coating of the airbag material to rupture along the sem and allow gas to escape and maintain a substantially constant overall maximum inflation pressure.
  • US 5 016 913 teaches the use of a heat-shrinking material to overly an exhaust opening in an airbag.
  • the heat-shrink material has an opening therein which grows larger when the material shrinks due to the heat of the inflation gas filling the airbag.
  • US 5 186 488 teaches an airbag having a low strength portion of a seam in the airbag material.
  • a frame shaped reinforcement patch is attached on the inside of the airbag in such a manner as to expose part of the low strength seam, thereby defining a part of the seam of preselected size which will fail when the inflation pressure exceeds a selected level.
  • US 5 310 215 teaches an airbag having a venting opening with a panel overlying the opening and secured, preferably with stitches, to the airbag material.
  • the panel restricts flow of the vented gas away from the vehicle occupant.
  • US 5 492 363 teaches an airbag with an exhaust valve having inner and outer membranes with a pucker formed therebetween and a flow passage from the inflation chamber to the pucker for expulsion of gas through an outer membrane aperture.
  • the inner membrane is extensible in response to impact of the vehicle occupant with the airbag which exceeds a threshold value so that the inner and outer membranes are brought together in nested engagement so as to dissipate the pucker.
  • US 5 518 269 discloses an airbag having a dynamic burn vent where inflation gas can be vented.
  • EP 0 670 247 A1 teaches an inflatable airbag having an opening therein for venting inflation gas.
  • a panel lies on an outer surface of the airbag and overlies at least a part of the opening.
  • the panel is formed of elastic material so that a portion of the panel may be stretched away from the opening to allow passage of inflation gas therethrough.
  • JA 06286570 A teaches the use of sheet-like elastic members of rubber or the like overlying the ventilation openings in an airbag, the elastic members having exhaust openings therein which are stretched to larger sizes as the inflation pressure in the airbag increases.
  • JA 06286569 teaches the use of slender exhaust openings, similar to slits, in the airbag with an elastic member, for example of rubber, extending transversely across the exhaust opening and attached to the airbag material.
  • an elastic member for example of rubber
  • US 3 527 475 discloses an airbag having a ventilation opening and a plastics sealing member across said ventilation opening.
  • the sealing member has an overlap region in contact with an outer surface of said airbag near an edge of said ventilation opening.
  • Securing means which secure the sealing member to the airbag, have welds securing the airbag, have welds securing the overlap region to said airbag.
  • JP 07323799 A discloses an airbag having similar features to the airbag of US 3 527 475.
  • EP 0 495 410 A1 teaches an inflatable airbag in accordance with the preamble of claim 1.
  • the object of the present invention is to provide an improved means for securing the sealing member to the airbag material.
  • an airbag having a ventilation opening which is sealed prior to the inflation pressure reaching a predetermined level. More particularly, in accordance with the present invention a sealing member, overlying the ventilation opening has a frangible region which breaks open at a predetermined pressure level in order to allow the inflation gas within the airbag to vent.
  • an inflatable airbag comprising: airbag material having an outer surface and an inner surface, said inner surface.defining an inflation chamber into which inflation gas is directed to inflate the airbag, said airbag material having a ventilation opening therein for venting inflation gas from the inflation chamber; a sealing member extending across and sealing the ventilation opening to inhibit said inflation gas from venting from said inflation chamber, said sealing member having a frangible region with a weakening line located at least partially over said ventilation opening, the frangible region of the sealing member being intact when the inflation pressure in said inflation chamber is below a predetermined level with the sealing member retaining the inflation gas within the airbag unless the inflation pressure reaches or exceeds said predetermined level, said frangible region capable of breaking open when the inflation pressure in said inflation chamber equals or exceeds said predetermined level; and, securing means for securing said sealing member to said airbag material, characterised in that said sealing member includes an overlap region on an inner side thereof, said overlap region being in contact with said outer surface of
  • Figures 2, 3, 5, 7-9 show a variety of securing means for securing a sealing member to the airbag material which do not fall within the scope of the present invention.
  • An embodiment of the present invention is shown in Figure 4.
  • FIG.1 shows an airbag 10, which is a component of a vehicle occupant protection system, in an inflated condition to protect a vehicle occupant 70.
  • the airbag 10 comprises airbag material 12 having an outer surface 16, an inner surface, and a sealing member 24 overlying a ventilation opening 30 in the airbag material.
  • airbag material is understood to mean any suitable coated or uncoated woven fabric as well as nonwoven films that may be used for an airbag.
  • inner As used herein and in the claims terms such as “inner”, “inner surface” and “inwardly” are understood to be used to refer to surfaces or directions with respect to their proximity to the inflation chamber which exists when an airbag is inflated with the inflation chamber on the inside of the airbag material. Furthermore, as used herein and in the claims terms such as “outer”, “outer surface” and “outwardly” are understood to be used to refer to surfaces or directions with respect to their opposition to the inflation chamber which exists when an airbag is inflated with the inflation chamber on the inside of the air bag material.
  • Figs, 2 and 3 which do not form part of the present invention, wherein Fig, 2 is a fragmentary plan view of an airbag having a ventilation mechanism and Fig. 3 is a side cross sectional view of a ventilation mechanism in an airbag a sealing member 24 is secured about the peripheral edge 34 of a ventilation opening 30 to inhibit the ventilation of inflation gas (not shown) from the airbag.
  • the ventilation opening 30 is represented by a circle in Fig. 2, it should be understood that the invention can be successfully practised with a ventilation opening 30 which is square, rectangular, oval or any other shape.
  • the securing means includes a flange 46 extending from the inner side 48 of sealing member 24.
  • the flange 46 includes a back wall 49 and a side wall 50.
  • the side wall 50, back wall 49 and an overlap region 51 of sealing member 24 define a channel 52 having a U-shaped cross-section.
  • the channel 52 receives the peripheral edge 34 of the ventilation opening 30 for securing the sealing member 24 to the airbag material 12.
  • the sealing member 24 can be thermoplastically moulded to the airbag material 12 using a manufacturing process commonly known as injection moulding or insert moulding.
  • frangible region 40 is included in sealing member 24.
  • frangible is understood to mean easily broken.
  • the frangible region 40 of the sealing member is located at least partially in juxtaposition with the ventilation opening 30. Put another way, at least part of the frangible region 40 of the sealing member is located side by side with, and overlying, the ventilation opening 30.
  • the frangible range 40 of the sealing member remains intact as the airbag 10 is inflating until the inflation pressure reaches a predetermined maximum level.
  • the frangible region 40 of the sealing member breaks open when the inflation pressure reaches or exceeds the predetermined level.
  • FIG. 4 shows an embodiment of the invention in which the frangible region 40 of the sealing member has been broken open by the inflation pressure and a resulting flap 44 is in a venting position.
  • the line where the frangible region 40 of the sealing member broke is defined by terminal edges 56A and 56B.
  • the inflation gas is vented through the ventilation opening 30 as shown by the arrow 60.
  • the sealing member 24 with a frangible region 40 cooperates with the ventilation opening 30 to form a pressure-sensitive airbag ventilation mechanism 45.
  • the sealing member 24 retains the inflation gas within the airbag 10 unless the inflation pressure reaches or exceeds a predetermined maximum level.
  • An airbag in accordance with the present invention has been manufactured wherein the airbag material was a silicon coated nylon and the sealing member comprised a thermoplastic polyolefin which was sewed to the airbag material to seal a circular ventilation opening having a diameter of about 55 mm. While the sealing member is preferably a plastic or polymeric sealing member attached to the airbag fabric by insert moulding; it is understood that the sealing member may be made of any suitable plastic, polymeric material.
  • the securing means comprises a sealing member with an extension 62 which protrudes from the inner side 48 of the sealing member 24 and extends through an opening 64 in the airbag material 12 in the region adjacent the ventilation opening 30.
  • the inner side 48 of the sealing member 24 includes a region 51 of the sealing member which overlaps and is secured to the outer surface 16 of the airbag material 12 around the peripheral edge 34 of the ventilation opening 30.
  • Such securement can be via any conventional means chosen with sound engineering judgement as discussed in the immediately preceding paragraph.
  • the securing means includes heat sealing in a region 76 of a sealing member 24 which overlaps the outer surface 16 of the airbag material 12 around the peripheral edge 34 of the ventilation opening 30.
  • an inflation gas is introduced into the interior of the airbag 10. If the vehicle collision is such as to quickly decelerate the vehicle, such as in a head-on collision, the vehicle occupant 70 moves forward against the airbag 10. The action of the inflation gas filling the airbag 10 and the action of the vehicle occupant 70 against the airbag 10 cause the pressure within the airbag 10 to increase.
  • the frangible region 40 of the sealing member 24 breaks.
  • the inflation pressure moves a flap 44 in the frangible region outwardly so that the ventilation opening 30 is no longer sealed.
  • the inflation gas is vented through the unsealed ventilation opening 30 so that the airbag 10 presents a more compliant surface to the occupant 70.
  • the frangible region 40 of a sealing member may include a series of indentations or perforations 72 located along weakening lines 76A, 76B, 76C, 76D, 76E, 76F and 76G to weaken the sealing member 24.
  • Indentations 72 may be perforations which extend either partially or totally through the sealing member 24.
  • the weakening line may be formed by moulding or pressing a groove into the sealing member to weaken it in a desired pattern and create a frangible region.
  • the sealing member 24 remains intact as the inflation pressure increases but upon attaining the predetermined maximum inflation pressure level, the sealing member 24 tears or breaks along the weakening line, or lines, 76A-76G.
  • the positioning of weakening lines 76A-76G determines the number of flaps formed when the frangible region 40 is opened.
  • Figs. 7 and 8 which do not form part of the present invention, the flap 44 of the frangible region 40 of the sealing member 24 is shown in dotted lines as it would open.
  • spot welds 78 are used to secure the sealing member 24 to the airbag 10. These spot welds 78 can be provided by several different methods, including heat staking.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Claims (4)

  1. Aufblasbarer Airbag (10), der folgendes umfaßt:
    Airbagmaterial (12) mit einer Außenfläche (16) und einer Innenfläche (20), wobei die Innenfläche eine Aufblaskammer definiert, in die Aufblasgas geleitet wird, um den Airbag aufzublasen, wobei das Airbagmaterial eine Entlüftungsöffnung (30) in demselben zum Entlüften von Aufblasgas aus der Aufblaskammer hat,
    ein Dichtungselement (24), das über die Entlüftungsöffnung verläuft und dieselbe abdichtet, um Aufblasgas am Entlüften aus der Aufblaskammer zu hindern, wobei das Dichtungselement einen zerbrechlichen Bereich (40) mit einer Schwächungslinie (76A bis 76G) hat, der sich wenigstens teilweise über der Entlüftungsöffnung befindet, wobei der zerbrechliche Bereich des Dichtungselements intakt ist, wenn der Aufblasdruck in der Aufblaskammer unterhalb eines vorher festgelegten Niveaus liegt, wobei das Dichtungselement das Aufblasgas innerhalb des Airbags zurückhält, wenn der Aufblasdruck nicht das vorher festgelegte Niveau erreicht oder übersteigt, wobei der zerbrechliche Bereich aufbrechen kann, wenn der Aufblasdruck in der Aufblaskammer das vorher festgelegte Niveau erreicht oder übersteigt, und
    Befestigungsmittel zum Befestigen des Dichtungsmittels am Airbagmaterial (12), dadurch gekennzeichnet, daß das Dichtungselement (24) einen Überlappungsbereich (51 ) an einer Innenseite desselben einschließt, wobei der Überlappungsbereich nahe einer Umfangskante (34) der Entlüftungsöffnung (30) in Kontakt mit der Außenfläche (16) des Airbagmaterials (12) ist, wobei das Befestigungsmittel einen Dichtungselementfortsatz (62) hat, der von einer Innenseite des Dichtungselements (24) vorspringt und in einem Bereich angrenzend an die Entlüftungsöffnung (30) durch eine Öffnung (64) im Airbagmaterial (12) verläuft.
  2. Airbag nach Anspruch 1, bei dem das Dichtungselement (24) aus Kunststoff hergestellt wird.
  3. Airbag nach Anspruch 1 oder 2, bei dem das Dichtungselement (24) eine Reihe von Vertiefungen in demselben hat, die eine Schwächungslinie (76A bis 76G) bilden.
  4. Airbag nach Anspruch 1, bei dem das Befestigungsmittel Schweißungen hat, die den Überlappungsbereich (51) am Airbagmaterial (12) befestigen, wobei die Schweißungen durch Heißsiegeln hergestellt werden.
EP97923421A 1996-07-09 1997-04-22 Druckempfindliche luftsack-entlüftungsvorrichtung Expired - Lifetime EP0910520B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US678530 1996-07-09
US08/678,530 US5704639A (en) 1996-07-09 1996-07-09 Pressure sensitive airbag vent mechanism
PCT/US1997/006465 WO1998001323A1 (en) 1996-07-09 1997-04-22 Pressure sensitive airbag vent mechanism

Publications (2)

Publication Number Publication Date
EP0910520A1 EP0910520A1 (de) 1999-04-28
EP0910520B1 true EP0910520B1 (de) 2003-12-17

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EP97923421A Expired - Lifetime EP0910520B1 (de) 1996-07-09 1997-04-22 Druckempfindliche luftsack-entlüftungsvorrichtung

Country Status (6)

Country Link
US (1) US5704639A (de)
EP (1) EP0910520B1 (de)
JP (1) JP2000515090A (de)
CA (1) CA2259392A1 (de)
DE (1) DE69726862T2 (de)
WO (1) WO1998001323A1 (de)

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Also Published As

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US5704639A (en) 1998-01-06
DE69726862T2 (de) 2004-11-04
EP0910520A1 (de) 1999-04-28
JP2000515090A (ja) 2000-11-14
CA2259392A1 (en) 1998-01-15
DE69726862D1 (de) 2004-01-29
WO1998001323A1 (en) 1998-01-15

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